Method for anticorrosive coating and treatment of metal parts
AssigneeDacral
InventorsDaniel Rouquier, Benoît Millet
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Abstract
The invention concerns a method for producing an anticorrosive coating for metal parts, free of chromium and chromium-based derivatives and in particular hexavalent chromium, preferably to be applied in thin layers while providing highly efficient protection. Said coating consists of the synergistic association of a first metal zinc layer and one or several coating layers obtained by using an aqueous composition containing a particulate metal, an appropriate solvent, a thickening agent and a binder consisting of a silane.
Claims26
A metal workpiece having a anticorrosion coating, characterized in that a metallic zinc layer is interposed between the metal workpiece and the coating and in that the coating comprises a synergistic combination of the metallic zinc layer, which is produced by mechanical deposition, and one or more layers obtained by using an aqueous composition containing a particulate metal, a solvent, and a binder consisting of silane.
A process of providing a metal workpiece with an anticorrosion coating, the process comprising steps of
- (a) mechanically depositing a metallic zinc layer on the metal workpiece and
- (b) coating the metallic zinc layer with one or more layers of an aqueous composition containing a particulate metal, a solvent, and a binder consisting of silane,
- wherein the workpiece is coated with a synergistic combination of the metallic zinc layer and the one or more coating layers.
Dependencies are inferred from the claim text.